Process of forming building material.



PATENTED MAR. 12, 1907.

J. DLTMANNS. PROCESS OF FORMING BUILDING MATERIAL.

APPLICATION FILED JUNE 11, 1906.

' N VE N TOE Jo fzamzea 0Z2'77za nus W/TNESSES' A TTOPNEYS its coating.

UNITED STATES P TENT OFF CE;

Jof'rANNEs OLTMANNS, or nm'rrreiiu, BADENI, GERMANY.

- PR ooEss OF FORMING BUILDING MATERIAL.

Specification of Letters Patent.

i Patented March 12,1907.

Application filed June I1,1906. .Serial No. 321,196.

material that will be very light but'possess-j ing great firmness and strength, that will be practically a non-conductor of heat and cold, that will not be influenced by changes in temperature, fire andsound proof, and'that on account of the cheapness of the raw material may be produced at a very low cost.

I will describe a process of forming building material embodying .my invention and then point outthe novel features in the appended claim. V

Reference is tobe had'to the accompany ing drawings, forming a part of this specification,-in which similar characters of reference indicate corresponding parts in'all the views.

Figure Us a face view of a section of building material embodying my invention; Fig. 2 is an edge view thereof, and Fig. 3 is a detail perspective showing one of the fibers and The building material comprises a binding or body portion 1such, for instance, as a mixture of plaster-of-paris and dextrin or cementand with the mixture a suitable fiber 2 is soaked. This fiber may consist of excelsior, vegetable fiber, or even straw.

After incorporatingthe three elements the mass is then, by machinery or by hand, 5 squeezedout and partly freed by such oper- 5 ation from the binding material, and so that I each fiber is only slightly covered with the binding material. After the squeezing operclaim as new and. desire name to this specification in the ation the mass is placed in a suitable device and well distributed, when it is to be molded by a slight pressuie, so that an interstitial tissue-like plate, slab, or block is produced, which is due to-each fiber taking to'its'elf a plastic form. In stating that the material takes a tissue-like form I mean thatit is pro vided with variously-disposed depressions 3 and small'holes. I

In order to give the slab, block, or the like a better appearance, it may be put into a larger mold or pressing device and covered, partly or all around with a coatingsuch, for instance, as plaster-of-paris or cement.

As in this process I employ any desired amount of fiber or the like and a compara tively small amount of binding material is used, as before stated, the material is of great lightness, at the same time possessing great firmness and strength, and on account of its porosity produced by the many small holes and cavities, it results practically in a non-conductor of heat and cold. I

.' Having thus described my invention, I"

to secure by Letters Patent The herein-described process of forming a slab, block or the like of building material, consisting in forming a'bifiger of plaster-ofparis and dextrin or the c, then soaking in. said binder a number of vegetable fibers,

then removing the .excess of binder from said slightly coverediwith said binder, and then molding the covered" fibers "into an interstitial body,"by;slight' pressure. In testimony whereof I have signed my presence of two subscribing witnesses. A JOHANNES. OLTMANNS. Q

I Witnesses KARL LAUBER, HEINRICH BAUSER.

. fibers, whereby the individual fibers are but Y 

